Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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' A DEVICE FOR INTRODUCTION AND/OR WITHDRAWAL OF A MEDIUM
INTO/FROM A CONTAINER
The present invention relates generally to a device
for introduction and/or withdrawal of a medium into/from
a container, and more particularly to such devices for
introduction and/or withdrawal of media into/from a
container as are intended for use in areas with very
strict requirements on low contamination risks inside the
container and/or in the container environment.
Within for instance the pharmaceutical and
biotechnology fields and to some extent in the food
manufacturing and cosmetic industries there is a
continuous need for sampling of media, for example for
micro-biology checks, cell counts, or for chemical
analysis, or for addition of regulating or active media,
such a pH-buffer of a biological starting culture, during
a certain processing step in the production of products
within each field. When such production is carried out
under conditions of low contamination requirements with
respect to the media that are taking part in the process,
the production normally is carried out in a sealed
container. However, contamination risks arise when a
medium is to be added to or a sample be withdrawn from
the container.
One example of a prior-art device for withdrawing
samples from a container for the above mentioned usages
is shown in US-A-3 779 082. The device comprises a self-
sealing membrane disposed in an aperture in the
container. A plurality of channels interconnect the
membrane with the area exteriorly of the container. A
transfer member fitted with a hypodermic needle may be
received in one of the channels, it being possible to
introduce the hypodermic needle through the membrane into
communication with the container interior. In this manner
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samples may be withdrawn from the container or a medium
be introduced into the container via the hypodermic
needle. A vinyl tape or the like covers the upper ends of ,
the channels until the transfer member is inserted into
the channels. The device may be pre-sterilised, in which ,
case the channels are not exposed to contamination risks
until a transfer member is inserted therein.
A drawback inherent in this construction is that the
upper part of the membrane may be contaminated in
connection with the transfer member contacting the
membrane. Impurities and the like may be drawn into the
container via the hypodermic needle. In addition, a small
amount of the medium will always accompany the hypodermic
needle as the latter is withdrawn from the membrane. In
this manner the area exteriorly of the container is
exposed to contamination risks when this prior device is
in use, which is particularly serious when for instance
specimen of toxic media are being withdrawn.
In US-A-3 776 042 is shown another device for
withdrawal of samples from a container. This device
comprises two self-sealing membrane parts which are
sealingly disposed in a hose fitting in a container. An
aseptic medium, such as steam or the like, flows from an
inlet to an outlet in the hose fitting intermediate the
membrane part. The hypodermic needle of a transfer member
pierces the outer membrane part and is disinfected by the
steam before being introduced into the inner membrane
into communication with the container interior. In this
position a sample may be withdrawn. When the hypodermic
needle is pulled out, it is again sterilised by steam in
the area intermediate the membrane parts.
The drawback inherent in this device is that to use
steam requires expensive special equipment. Steam may be
useful for sterilising against bacteria but this '
equipment cannot be used for sampling media that must not
contaminate the environment and that are not destroyed by
steam, since they may accompany the hypodermic needle as
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the latter is withdrawn from the two membrane parts or
contaminate the area between the membrane parts or the
steam tube system connected to the area between the
membrane parts. In addition, the sample and the
environment may come into contact with one another via
the hypodermic needle tunnel, once the hypodermic needle
has been withdrawn from the membrane parts, which in
itself constitutes a contamination risk.
On account of the risks of contamination of the
medium inside the container and the container
environment, sampling or introducing of media normally
are carried out in "clean rooms" by means of devices in
accordance with prior-art technology, which envolves high
investment costs for ventilation equipment, locks and the
like, in addition to which the requirements on the
personnel working in the "clean room" are particularly
severe.
A first object of the subject invention thus is to
provide a device for introduction and/or withdrawal of a
medium into/from a container, according to which the
medium upon and following withdrawal is protected from
contamination from the environment.
A second object of the present invention is to
provide a device for introduction and/or withdrawal of a
medium into/from a container, according to which the
environment is protected from contamination from the
medium being withdrawn.
A third object of the present invention is to
provide a device for introduction and/or withdrawal of a
medium into/from a container, according to which the
medium, when being introduced into the container, is
protected from contamination from the environment.
A fourth object of the present invention is to
provide a device for introduction and/or withdrawal of a
medium into/from a container, according to which the
environment is protected from contamination during
introduction of a medium into the container.
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A fifth object of the present invention is to
provide a device for introduction and/or withdrawal of a
medium into/from a container, according to which a sample
that has been withdrawn from the container, is
representative of the medium inside the container. ,
A sixth object of the present invention is to
provide a device for introduction and/or withdrawal of a
medium into/from a container, according to which the
device may be used also outside "clean rooms".
These and other objects are achieved in accordance
with the invention by means of a device for introduction
and/or withdrawal of a medium into/from a container as
defined in claim 1.
Other particularities and advantageous embodiments
a're defined in the dependent claims.
In the following will be described currently
preferred embodiments of the present invention in closer
detail with reference to the accompaning drawings,
wherein:
Fig. 1 is a schematical exploded view showing one
embodiment of a device for introduction and/or withdrawal
of a medium into/from a container.
Fig. 2 illustrates the device of Fig. 1 schemati-
cally in its assembled condition.
Fig. 3 is a schematical cross-sectional view showing
a transfer member with the tip of a hypodermic needle
disposed in a protective membrane portion.
Fig. 4 is a schematical cross-sectional view of the
transfer member of Fig. 3, according to which the tip of
3-0 the hypodermic needle as penetrated the membrane portion.
Fig. 5 is a schematic cross-sectional view
illustrating the device when attached to a container. '
Fig. 6 is a schematic perspective view, showing an
alternative embodiment of a collection receptacle in a
compressed condition.
Fig. 7 is a shematical cross-sectional view of the
collection receptacle illustrated in Fig. 6, showing said
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receptacle in an expanded position and also showing
schematically, by means of a dash-and-dot line, the
collection receptacle in its compressed condition.
The device illustrated in Fig. 1 comprises five
5 transfer members each one of which is designated
generally by reference 1. In accordance with a preferred
embodiment the transfer member 1 is an injector/ejector
means. At its lower end each transfer member is formed
with a seal, generally designated by reference 2. In
addition, the device comprises a fastening device,
generally designated by 3, which device consists of three
parts.
Each transfer member 1 is provided with a holder 4.
The holder encloses the upper end of a hypodermic needle
5. The lower edge of the holder 4 is formed with a
downwardly open groove 6 having an essentially circular
cross-sectional configuration.
The seal 2 is formed with an upper bellows-shaped
part 7. At its upper end the bellows-shaped part 7 is
formed with a bead 8 which is inserted in the groove 6,
thus sealingly interconnecting the seal 2 and the holder
4. The bellows-shaped part 7 encloses the hypodermic
needle 5 in the longitudinal direction thereof and it may
be compressed in the lengthwise direction of the needle 5
between the positions illustrated in Figs 3 and 4,
respectively. At its lower end the seal 2 is formed with
a membrane portion 9 the upper end of which is sealingly
attached to the bellows-shaped part 7. The membrane
portion 9 is self-sealing and is pierceable by the tip 10
of the hypodermic needle.
The fastening device 3 comprises one flanged part,
' generally designated by reference 11. The flanged part 11
is formed with an essentially circular base plate 12 in
' which five through holes 13 are made, each having a
diameter-size allowing passage therethrough of a
hypodermic needle 5. About each hole 13, in the upper
face of the base plate 12, is formed a seat 14, said seat
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being essentially centered about the hole 13. The lower
end of the membrane portion 9 is formed with a collar 15
fitting the seat 14. From the upper face of the flanged ,
part 11, projecting essentially perpendicularly
therefrom, is arranged a stub axle 16 having a threaded ,
upper end.
The fastening device 3 likewise comprises an
essentially cylindrical magazine part, generally
designated by 17. A centrally located, longitudinal
through channel 18 passes through the magazine part 17,
through which channel the stub axle 16 may project. In
addition, the magazine part 17 is formed with five
through apertures 19 extending in parallel with channel
18 and having a diameter-size corresponding to or
slightly exceeding the diameter-sizes of the holder 4,
the bellows-shaped part 7, and the upper end of the
membrane portion 9 but being smaller than the diameter of
the collar 15. The lower end of each aperture 19 is
connected to a longitudinal outwardly open groove 20
provided in the peripheral surface of the magazine part
17 exteriorly of the associated aperture 19. At its upper
end, the groove 20 is formed with two lateral recesses
21.
The magazine part 17 and the flanged part 11 have a
centering means generally designated by 22 (see Fig. 2).
The centering means 22 comprises at least one pin 23
projecting essentially perpendicularly from the lower
part of the peripheral surface of the magazine part 17.
The flanged part 11 is formed on its upper face with an
annular means 24 matching the cross-sectional area of the
magazine part 17 so as to fit the exterior of the latter.
The annular means 24 is formed with at least one slit 25
into which the pin 23 may be inserted.
The upper end of the hypodermic needle 5 is
sealingly connected to a hose socket or fitting 26 which
is receivable in the groove 20. The hose socket 26 may be
formed with a peripheral stop shoulder 27 (see Fig. 1)
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alternatively, the hose socket 26 may in itself function
as a stop shoulder (see Figs 3 and 4). In Figs 1 and 2
. the stop shoulder 27 has a larger diameter-size than the
groove 20 and is spaced such a distance from the holder 4
that the transfer member 1 may be introduced into the
aperture 19 and the groove 20 from the lower end of the
magazine part 17.
In addition, fastening device 3 comprises a locking
part, generally designated by 28, said locking part being
formed at its upper end with a knob 29 and at its lower
end with a threaded bore (not shown) into which the stub
axle 16 may be screwed.
The stub axle 16, the channel 18, and the locking
part 28 together form a device fastening means, generally
designated by reference 30.
The hose socket 26 is sealingly connected to a
collection receptacle, generally designated by 31,
preferably by means of a hose 32. The collection
receptacle 31, shown in a cross-sectional view in Fig. 5,
has a bottom portion 33 and a top portion 34 which are
sealingly interconnected. The bottom portion 33 is
manufactured from a stiffer material than the top portion
4. The top portion 34 is formed with an essentially
centered handle 40 on its exterior and may be formed with
folding initiation means 35 on its surface, essentially
centered about the handle 40. The collection receptacle
31 is expandable into the configuration illustrated by
the right-hand receptacle in Fig. 5, and compressible
into the configuration shown by the left-hand collection
receptacles in Fig. 5. The expansion and compression, may
if required, be facilitated by the folding initiation
means 35. However, such means are not a precondition for
the function of the collection receptacle 31.
The operation of the device will appear from the
description to follow. The flanged part 11 is associated
with a container, generally designated by 36, via an
aperture 37 therein. The flanged part 11 is secured in
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the aperture 37 in such a manner that it seals the edges
of the aperture 37. In this position the holes 13 set the
interior of the container 36 in communication with the
environment. Initially, the container is empty (not
shown) and it is of the type used in processes requiring ,
containers that may be sealed off against the
environment.
Five unused transfer members 11 are inserted into
the magazine part 17 from underneath. The stop shoulders
27 are then turned laterally into locking engagement with
a lateral recess 21 (see Fig. 2). When a transfer member
1 assumes its inserted position its collar 15 abuts
against the lower portion of the magazine part 17. The
upper portion of the holder 4 projects through the upper
portion of the magazine part 17. In this starting
position each hypodermic needle 5 is sealingly introduced
into the membrane portion 9 to assume the position
illustrated in Fig. 3. The magazine part 17 is then slid
over the stub axle 16. The annular means 24, the pin 23
and the slit 25 co-operate to center the magazine part 17
in such a manner that the hypodermic needle 5 of each
transfer member 1 will be positioned straight above a
corresponding hole 13. The collar 15 of each transfer
member 1 fits the corresponding seat 14. The locking part
28 is then screwed onto the stub axle 16, whereby the
magazine part 17 is locked in the position illustrated in
Fig. 2. In this locked position the material of the self-
sealing collar 15 is compressed, exerting a sealing
pressing action against the seat 14, whereby the holes 13
will be sealed against the environment.
The hypodermic needle 5, the hose 32 and the
collection receptacle 31 form a unit that is sealed '
against the environment as long as the hypodermic needle
5 remains in the position illustrated in Fig. 3. The unit '
preferably is pre-sterilised. At their upper ends the
collection receptacles 31 are formed with an aperture by
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means of which the receptacles may be suspended from hook
means 38 on the container 36.
After the device thus having been secured to the
container 36 in the manner described, the interior of the
container 36 may be cleansed and sterilised in any known
manner. During this procedure the inner face of the
flanged part 11, the holes 13 and the lower part of the
membrane portion 9 in contact with the interior of the
tank are cleaned. All components of the device that come
into contact with the interior of the container 36 thus
will achieve the same degree of purity as the interior of
the container 36, whereby the risks of contamination from
these components are eliminated.
The container 36 is thereafter filled with a medium
39 to a level above the aperture 37 and the process
inside the container may be initiated. When samples are
to be withdrawn from the container 36 the stop shoulder
27 of one of the transfer members 1 is turned to dislodge
it from its locking engagement with a lateral recess 21.
The stop shoulder 27 is then displaced, and consequently
also the hypodermic needle 5 and the bellows-shaped part
7, in the lengthwise direction of the groove 20 and the
aperture 19, to the position illustrated in Figs 4 and 5
by reference 41, wherein the tip 10 of the hypodermic
needle 5 has penetrated the membrane portion 9. In this
position, the collection receptacle 31 is in sealed
communication with the interior of the container 36.
Since the tip 10 of the hypodermic needle 5 is pre-
sterilised no contamination has arisen from this
movement.
Owing to the hydrostatic pressure caused by the
' level differences between the medium inside the container
36 and the collection receptacle 31, the medium 39 may in
position 41 illustrated in Fig. 5 flow through the
hypodermic needle 5, through the hose 32 to be collected
in the collection receptacle 31. As the container 31 is
being filled, it expands, and this expansion is
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facilitated by the above-mention folding initiation means
35. In order to speed up the filling operation the
collection receptacle 31 may initially be expanded
manually with the aid of the handle 40, causing a vacuum
5 pressure to generate in the collection receptacle 31.
When a sufficient amount of the medium 39 has been
withdrawn from the container 36, the transfer member 1 is
retracted to the position illustrated in Figs 3 and 5 by
reference 42 and it is locked in that position through
10 the engagement of the stop shoulder 27 in the a lateral
recess 21. This seals the channel formed by the needle 5
inside the membrane portion 9, whereby the tip 10 of the
hypodermic needle 5 will be sealed inside the membrane
portion 9. Since the hypodermic needle 5, the hose 32 and
the collection receptacle 31 again form a closed, sealed
system contamination of the withdrawn sample or
contamination of the environment outside the container 36
are prevented. Owing to the lower collar 15 of the
membrane portion 9 being pressed against the seat 14 of
the fastening means 30 the sealing effect between these
parts is improved, in addition to which the self-sealing
capacity of the membrane portion 9 is increased.
The hose 32 leading to a filled collection
receptacle 31 may thereafter be sealingly cut off by a
cutter means (not shown), whereupon the collection
receptacle 31 may be transported to a laboratory or the
like while still all contamination risks are avoided. The
cutting means could for example be a device of the kind
that fuses together the two hose ends, or it could be a
device which sealingly squeezes together the hose ends by
means of clamps.
Five samples may be withdrawn by the device in
accordance with the shown embodiment. The number of
devices for a container 36 as well as the number of
transfer members 1 for each device could, however,
differ.
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When the process in the container 36 has come to an
end, the container is emptied, cleansed and disinfected
from within. During this operation the components of the
device that are exposed to the tank interior are
cleansed. The locking part 28 may then be released and
the magazine part 17 be pulled off from the stub axle 16
without risks of contaminating the environment. The
entire magazine part 17 may then be exchanged for a new
magazine part 17 that is loaded with unused transfer
members 1. Alternatively, it is possible to replace used
transfer members 1 in one and the same magazine part 17.
As long as used hypodermic needles 5 are not pulled out
of the membrane portion 9 the hypodermic needle 5 and the
corresponding cut-off hose end form a closed, sealed
system. Used hypodermic needles, hose parts and
collection receptacles are destructed in a manner
suitable considering the medium, for instance by
incineration. The parts of the device which after use are
to be destructed preferably are incinerated, since these
parts as such are manufactured from a combustible
material that does not emit noxious fumes. The magazine
part 17 is then locked in the position as indicated above
and the interior of the container 36 is cleaned and
disinfected preparatory to a new process step.
The hose 32 of a filled collection receptacle 31
obviously need not be cut off for transportation of the
sample when the magazine part 17 is removed from the
container 36. Instead, the transfer member -1 may be
removed from the magazine part 17, and the transfer
member l, the hose 32, and the collection receptacle 31
be transported to a laboratory or the like.
Alternatively, the hose 32 may be directly connected to
analysis equipment, to another container or the like.
It is not either necessary to remove the magazine
part 17 and the transfer member 1 each time the container
36 is emptied and cleaned, since the parts of the device
that are exposed to the interior of the container 36 are
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imparted the same degree of purity as the container
interior upon cleaning and disinfection thereof.
Consequently, the device may be used in several
processing steps without being removed, as long as the
number of unused transfer members 1 is sufficiently ,
large.
A second hose may be sealingly connected to the
collection receptacle 31 or to the hose 32. At the end of
the second hose a pre-sterilised syringe may be sealingly
attached for transfer of the specimen to another
container or the like. Furthermore, the second hose may
be connected to a second transfer member 1. In this
manner, the medium 39 may be withdrawn from a container
36 in a sealed condition and be introduced into a second
container (not shown) in sealed condition by means of a
device as described above. In this case a hypodermic
needle 10 is introduced into the second container,
whereupon the collection receptacle 3I is positioned
above the level of the medium in the second container,
whereupon the medium in sealed condition may be
introduced into the container by means of the hydrostatic
pressure. In order to facilitate the introduction of the
medium the deformable upper portion 34 of the collection
receptacle 31 may be compressed against the bottom
portion 33.
Figs 6-7 illustrate a second embodiment of a
collection receptacle 31'. Parts similar to those
described with reference to Figs 1-5 have received the
same references in Figs 6-7 but with the addition of a
prime sign. The collection receptacle 31' comprises a
first essentially arch-shaped part 33' and a second
essentially arch-shaped flexible part 34'. In accordance '
with the embodiment illustrated the parts 33' and 34' are
essentially domed and preferably are manufactured from a '
plastics material, the first part 33' preferably being
manufactured from a material possessing a higher degree
of rigidity than material of the second flexible part
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34'. In Fig. 7 continuous lines illustrate the collection
receptacle 34' in an expanded position in which it is
filled with medium 39' whereas dash-and-dot-lines
illustrate the receptacle in its compressed position. In
the compressed position the second flexible part 34' is
disposed adjacent the first part 33' to allow a
collection receptacle 31' to be completely emptied of
medium 39' that has collected therein. As appears from
Figs 6-7 a handle 40' is provided on the second flexible
part 34' to facilitate handling of the second flexible
part 34' between the expanded position and the compressed
position. However, it is easily understood that it is
likewise possible to realise the shift from one position
to the other in some other way, for example by making use
of the hydrostatic pressure like in the first embodiment
above.
The first part 33' and the second flexible part 34'
are interconnected in an interconnection area 50 along a
facing marginal portions of the parts. The joint or
interconnection beetween the parts 33'-34' may be made
for instance by gluing or welding. As appears from Fig. 7
the interconnection area 50 in accordance with the shown
preferred embodiment extends essentially in parallel with
the extension of the marginal areas of the second
flexible part 34' in the expanded position. Owing to this
arrangement the risk of bursting of the second flexible
part 34' in the interconnection area 30' is reduced as is
also the risk of tearing in the connection area 50 as the
collection receptacle 51 is exposed to an excess
pressure, e.g. in comparison with a structure wherein an
interconnection area between the first and the second
' parts extends horizontally with respect to Fig. 7 (not
shown).
' Externally of its dome the first part 33' preferably
is formed with an annular collar or flange 51 which
extends along said interconnection area 50 and which is
connected to the second flexible part 34' by being joined
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thereto in the interconnection area 50. The collar 51 and
the first part 33' are interconnected in accordance with
the shown embodiment along a peaked rim 52 bent at a
preferably acute angle a, across which rim the second
flexible part 34' may be shifted between the compressed ,
position and the expanded position. Preferably, the
interconnection area 50 extends exteriorly of said peaked
rim 52. The rim 52 consequently acts as a "hinge" across
which the second flexible part 34' moves between the
expanded and the compressed positions. When the
interconnection area 50 extends beyond said peaked rim
52, as is the case in accordance with the preferred
embodiment, the "hinge" movement affects the
interconnection area 50 less as this second flexible part
34' moves, as compared with what would be the case, had
said interconnection for instance extended up to or
terminated interiorly of said marginal area 50. The
movement of the second flexible part 34 thus is effected
in accordance with the embodiment in an area which is
disposed interiorly of the interconnection area 50,
imparting higher strength to the interconnection between
the first part 33' and the second flexible part 34'.
As illustrated in Fig. 6 the collection receptacle
31' is formed with at least one channel 53 which in
accordance with the embodiment shown extends through said
interconnection area 50 and which in accordance with the
shown embodiment is connected to a hose 32', the latter
in turn being connected to a hypodermic needle disposed
in a transfer member 1' of similar construction to that
described above and which has a holder 4' and a seal
means 2'. In this manner, the collection receptacle 31'
thus is connected to the hypodermic needle of the '
transfer member 1'. In accordance with the shown
embodiment the channel 53 is likewise by means of a '
second hose 54 connected to a hypodermic needle 55 known
per se, which is provided in a close-fitting removable
cover 56. A clamping device 57 known per se is arranged
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about the second hose 54 in accordance with the shown
embodiment. The entire unit illustrated in Fig. 6 is
preferably pre-sterilised and preferably forms a sealed
unit prior to use.
The collection receptacle 31' and accessories are
shown in Fig. 6 in a transportation position wherein the
hoses 32' and 54 are disposed underneath flaps 58 and 59,
respectively fastened by snap fasteners. The clamping
device 57 and/or the hoses 32' and 54, respectively,
and/or the transfer member 1 preferably are disposed in
depressed parts in a holder 62 located around the
collection receptacle 31' in order to provide improved
stackability of the collection receptacle 31'. In
accordance with the shown preferred embodiment the holder
62 is a continuation of the first part 33'. Consequently,
for instance the hoses 32' and 54 may be disposed in the
position of transportation in grooves 60 and 61,
respectively, as seen in Fig. 7. Also the clamping device
57 is illustrated in Fig. 6 in a depressed position in
the holder 62.
As appears from Fig. 6 the second flexible part 34'
is formed in accordance with the shown embodiment with a
portion 63 which for instance by welding or gluing is
interconnected with the holder adjacent the channel 53
and the area of interconnection of the channel 53 with
the respective hose 32', 54 to allow sealing inter-
connection of the respective hose 32', 54 with the
collection receptacle 31'.
It is easily understood that via the collection
receptacle 31' and a hypodermic needle arrangement 55,
56, 57 and/or directly, the transfer member 1' may be
' connected to another container, another collection
vessel, analysis equipment, or some other form of
' receptacle, etcetera.
By the inventive construction a device is provided
according to which the introduced and/or withdrawn medium
is protected from contamination from the environment of
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the container 36. In addition a device is provided
protecting the environment from the withdrawn and/or
introduced medium. Owing to this device a representative
specimen may be withdrawn from the container without
involving or causing contamination risks. Because the ,
device, when correctly used, eliminates contamination
risks in the container and in its environment, the
container may be disposed in an ordinary room with no
particular strict requirements on cleanliness. Because a
collars 15 of the different transfer members 1 are
separate from one another upon sampling or introduction
of medium into the container 36 there is no risk of
cross-contamination between a first collar 15 and a
second collar 15. Because it is clearly apparent from a
filled collection receptacle 31; 31' or from a cut-off
hose 32; 32'; 54 that the corresponding transfer member
1; 1' has been used the risk that a hypodermic needle 5
would be used twice by mistake is very small, which, had
it occurred, could have involved a contamination risk.
Because the hypodermic needle 5, the hose 32; 32', and
the collection receptacle 31; 31' form a pre-sterilised
sealed unit and because the parts of the device that are
exposed to the container interior are cleansed and
disinfected simultaneously with the cleaning and the
disinfection of the container, the device has a
contamination level corresponding to that of the
container interior. Because the point on the hose 32; 32'
where the cut is effected is sealed the joint can never
contaminate the environment.
It is easily understood that certain deviations from
the descried embodiment may be made. For instance the
number of parts and the configuration of the fastening '
device 3 may be varied. In addition, the hose 32; 32'
could for instance be a tube. The grooves 20 may run '
along the entire outer face of the magazine part 17 and a
stop/locking device be arranged in the locking part 28,
the function of which corresponds to that of the stop
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means and the locking means in the upper part of the
groove 20 and the lateral recesses 21. The container 36
_ obviously could be in the form of a tank, a tube pipe or
other type of vessel. All such of varieties and
modifications that are encompassed by the basic inventive
concept should be regarded to be within the scope of the
appended claims.
